Unisom in third tri, quit before labor or continue?

I have been taking a small amount of unisom since first trimester to help with nausea. It’s also helped me sleep in the third trimester. I’m taking like a quarter of one pill each night, but was thinking it might be good to fully get off it ahead of labor. My thinking is that unisom crosses the placenta and it might be easier for baby to come into the world after unisom is no longer in his system.

For moms that took it through going into labor, do you feel like it negatively affected baby? I’m probably overthinking it because I take such a low dose and the first few weeks are gonna be a mess anyway, but curious if anyone has any thoughts on this.